Which treatment is used for Sarcoptes infestation?

• A. Amitraz
• B. Fipronil
• C. Selamectin
• D. Ivermectin

Answer: (C)

Sarcoptic mange is treated by killing the mites that burrow in the skin, with an agent that reaches the mites in the skin and oil secretions. A topical macrocyclic lactone like selamectin is widely used for this purpose because, when applied to the skin, it distributes systemically and into the skin where the mites reside, and repeated monthly applications effectively clear infection.

Selamectin is convenient and generally well tolerated at labeled doses, and it also controls other parasites such as fleas and ear mites, making it a practical one-drug solution for a mange case.

Amitraz can be effective but requires dips or multiple applications and carries safety considerations in some animals. Fipronil mainly targets fleas and ticks and is not consistently reliable against Sarcoptes. Ivermectin can be effective, but some dogs (due to genetic sensitivity) may be at risk with standard doses, making selamectin a preferred option in many situations.